EP2139296A2 - Dispositif d'éclairage à DEL - Google Patents

Dispositif d'éclairage à DEL Download PDF

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Publication number
EP2139296A2
EP2139296A2 EP20090163665 EP09163665A EP2139296A2 EP 2139296 A2 EP2139296 A2 EP 2139296A2 EP 20090163665 EP20090163665 EP 20090163665 EP 09163665 A EP09163665 A EP 09163665A EP 2139296 A2 EP2139296 A2 EP 2139296A2
Authority
EP
European Patent Office
Prior art keywords
dimming signal
led
emission amount
dimming
emission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20090163665
Other languages
German (de)
English (en)
Other versions
EP2139296A3 (fr
EP2139296B1 (fr
Inventor
Sako Hiroyuki
Yamazaki Shigeaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Electric Works Co Ltd
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Publication date
Application filed by Panasonic Electric Works Co Ltd filed Critical Panasonic Electric Works Co Ltd
Publication of EP2139296A2 publication Critical patent/EP2139296A2/fr
Publication of EP2139296A3 publication Critical patent/EP2139296A3/fr
Application granted granted Critical
Publication of EP2139296B1 publication Critical patent/EP2139296B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light

Definitions

  • the present invention relates to a LED illuminating device that employs a plurality of LEDs emitting different light colors as a light source and that has a function for changing a light color by dimming each of the LEDs.
  • a conventional LED illuminating device has a problem where a same color cannot be obtained because of: unevenness of luminance of LEDs; and unevenness of emission colors of the LEDs themselves even in a case of lighting a plurality of LED illuminating devices in a same lighting state.
  • An object of the present invention is to provide, at a low price, a LED illuminating device that reduces unevenness of the color even when the luminance of LEDs are uneven and the emission colors of the LEDs themselves are uneven.
  • an LED illuminating device of the present invention includes: a power source device 1; a controller 2; an LED lighting device 3; and an LED unit 4 incorporating LEDs of a plurality of emission colors as shown in Fig.
  • the LED illuminating device is configured so that: a coefficient specific to the LED unit at which an emission color of the LED unit 4 becomes a desired color can be set to a signal value of the controller 2 preliminarily set as a standard; and the LED lighting device 3 can control an emission amount of the LEDs having the respective emission colors by using a value calculated by a calculation expression employing the specific coefficient.
  • the invention is configured so that: a coefficient specified to a LED unit at which an emission color of the LED unit becomes a desired color can be set to a signal value of the controller preliminarily set as a standard; and the LED lighting device can adjust an emission amount of the LEDs of respective emission colors by using a value calculated from the specific coefficient, thus an LED illuminating device having a small color unevenness between the respective devices regardless of unevenness of luminance of the LEDs and emission colors of LEDs themselves can be provided.
  • Fig. 1 shows a first embodiment of the present invention.
  • a LED illuminating device includes a power supply device 1, a controller 2, a LED lighting device 3, and a LED unit 4.
  • the LED unit 4 includes LEDs of emission colors, red (R), green (G), and blue (B), and is able to emit light in various colors by adequately changing an emission intensity of each of LEDs, R, G, and B.
  • the power supply device 1 is a power supply for driving the LED lighting device, the power supply being supplied at, for example, DC 30V.
  • the controller 2 is composed of three sliding volume faders, and labels of red (R), green (G), and blue (B) are added to the respective faders.
  • Outputs of the controller 2 are connected to the LED lighting device 3, and are configured so as to transmit positional scale information of the respective volume faders to the LED lighting device 3.
  • the positional scale information of the respective volume faders are shown as fR, fG, and fB, and a minimum value of their possible values is 0 and a maximum value is 1.
  • the LED lighting device 3 changes a lighting state of the LED unit 4 on the basis of the positional scale information of the volume faders from the controller 2.
  • Luminance of the LEDs controlled by the LED lighting device 3 are shown as ⁇ R, ⁇ G, and ⁇ B, and a minimum value of their possible values is 0 and a maximum value is 1.
  • the white color can be certainly reproduced when fR, fG, and fB are equal to 1.
  • another LED unit 4 also can be lighted in the white color by obtaining other kR, kG, and kB (coefficients specific to the LED unit).
  • Figs 2 and 3 show graphs obtained by calculating a synthetic light flux and a synthetic chromaticity in operating the volume faders in a case where unevenness of the respective LEDs show the values of the table 1.
  • Figs. 4 and 5 show graphs obtained by calculating the synthetic light flux and the synthetic chromaticity in operating the volume faders in a case where the unevenness of the respective LEDs show the values of the table 2.
  • the device since the device is configured to employ values obtained by multiplying indication values fR, fG, and fB of the volume faders of the controller 2 by the preliminarily-set constants kR, kG, and kB specific to the LED unit 4 as the lighting control values ⁇ R, ⁇ G, and ⁇ B of each LED, the low-cost LED illuminating device that reduces the color unevenness between the illumination devices despite unevenness of the LED unit 4 can be provided.
  • the output voltage of the power supply device 1 is DC 30V in the configuration, however, other DC voltages and AC voltages may be employed.
  • Means adapted to transmit information from the controller 2 to the LED lighting device 3 may be a digital signal (the DMX signal, the PNM signal, and the like) and may be an analog signal (the DC voltage, the PWM signal, and the like).
  • the lighting control means of the LED lighting device 3 may control the lighting by: changing a current passing through a LED load; and changing the duty of a pulsed load current.
  • a technical idea of the present invention can be arbitrarily applied if applied to light sources of different colors, and can provide the same effect also to unevenness of light sources such as an organic EL, laser light, and an incandescent light through filter. It is the same with following each embodiment.
  • a configuration according to a second embodiment of the present invention is the configuration of Fig. 1 same as that of first embodiment.
  • the lighting control of the LED lighting device 3 is controlled on the basis of following expressions.
  • the max (a, b) is a function for showing the larger value, a or b.
  • Figs. 6 and 7 show graphs obtained, in a case of employing the control method, by calculating a synthetic light flux and a synthetic chromaticity in operating the volume faders in a case where unevenness of the respective LEDs show the values of the table 1.
  • Figs. 8 and 9 show graphs obtained by calculating a synthetic light flux and a synthetic chromaticity in a pattern of different operation of the volume faders in a case where unevenness of the respective LEDs show the values of the table 1.
  • the device since the device is configured to: calculate an amount of the light flux to be outputted according to the above-mentioned calculation expressions by using values obtained by multiplying indication values of the volume faders of the controller by the preliminarily-set constants specific to the LED unit; and employ the amount as a lighting control value of the LED, the low-cost LED illuminating device that reduces the color unevenness between the illumination devices despite unevenness of the LED unit 4 can be provided.
  • the coefficient multiplied by the indication value of the volume fader is 1 in a case of setting the volume fader to be a single color, and thus the device is configured not to lower the light flux of the single color even when the LED is uneven.
  • a configuration according to a third embodiment of the present invention is the configuration of Fig. 1 same as that of first embodiment.
  • the lighting control of the LED lighting device 3 is controlled on the basis of the following expressions.
  • Figs. 10 and Fig. 11 show graphs obtained, in the case of employing the control method, by calculating a synthetic light flux and a synthetic chromaticity in operating the volume faders in a case where unevenness of the respective LEDs show the values of the table 1.
  • Figs. 12 and 13 show graphs obtained by calculating a synthetic light flux and a synthetic chromaticity in a pattern of different operation of the volume faders in a case where unevenness of the respective LEDs show the values of the table 1.
  • the present embodiment has advantages that allow an intuitive operation for adjustment of the volume fader to facilitate a color matching.
  • the device since the device is configured to: calculate an amount of the light flux to be outputted according to the above-mentioned calculation expressions by using values obtained by multiplying indication values of the volume faders of the controller by the preliminarily-set constants specific to the LED load; and employ the amount as the lighting control value of the LED, the low-cost LED illuminating device that reduces the color unevenness between the illumination devices despite unevenness of the LED load can be provided.
  • the coefficient multiplied by the indication value of the volume fader is 1 in a case of setting the volume fader to be a single color, and thus the device is configured not to lower the light flux of the single color even when the LED is uneven.
  • the characteristic since the characteristic has no changing point in operation of the volume fader and linearly changes, an intuitive operation is realized.
  • a relationship between the operation of the volume fader and a fading time is described as a proportional relationship in the graph of the present embodiment, and a non-linear specific function (the Munsell curve, a 2.3th power curve, and the like) of time is generally used to smooth an appearance of light, however, when any relationship is employed as the relationship between the volume fader and the time, a same effect can be obtained regardless of a way of thinking of the present invention, and when there is no relationship between an actual operation amount of the volume fader and a value of the volume fader, a same effect can be obtained.
  • a LED mounting LEDs of three colors, RGB, in a singly package called 3-in-1 exists, and, in the LED, a current value able to flow when the LED is lighted in a single color is different from a current value able to flow when the three colors of RGB are lighted at the same time.
  • the current value of the LED is adjusted according to the following expressions by using the luminance values ⁇ R, ⁇ G, and ⁇ B of the LEDs obtained by the calculation expressions of the above-mentioned embodiments, the light is naturally-dimmed in both of the light flux and the chromaticity.
  • IRO, IG0, and IBO represent electric currents passing through each of the LEDs of R, G, and B to output ⁇ R, ⁇ G, and ⁇ B, respectively, and IR, IG, and IB represent current values adjusted for the 3-in-1 LED.
  • the present invention can be applied to an LED illumination device including an LED unit having four types of light colors, which can be knew by analogy from the above-mentioned first to third embodiments.
  • Figs. 14 to 18 show schematic configurations of LED illuminating devices according to a fourth embodiment of the present invention.
  • a subtle color matching can be carried out by a mechanistic operation to realize a control for reducing unevenness of colors between the LED illuminating devices.
  • the light colors are adjusted by changing current values of the respective LEDs of R, G, and B, and in the case where the LEDs are fixed to have the identical position relationship, the mixing state of colors is sometimes uneven when a mixed light color, for example, an even white is represented, however, the mixing state of colors can be variously adjusted and an even mixed color can be represented by changing the configuration as shown in Figs. 14 to 18 .
  • Figs. 14 to 18 are examples, and the present invention is not limited to these configurations. Though it is preferred to automatically adjust the color correction, means by manual adjustment may be employed.
  • light outputs of R, G, and B are changed independently by the mechanistic operation, however, by simultaneously changing the respective current values of LEDs also as in the first to third embodiments, an optimum light color may be set by the current value and the changing means for configuration.
  • an optimum light color may be set by the current value and the changing means for configuration.
  • Fig. 14 is characterized by including means adapted to adjust the synthetic color of outputted light by individually changing a height of each LED when the LEDs of R, G, and B are housed in one structure.
  • the synthetic light color of the light output (for example, white) from the LED unit 4 is detected and the individual heights of the LEDs 4a, 4b, and 4c of R, G, and B are automatically or manually adjusted so that a predetermined light color is emitted.
  • Fig. 15 is characterized by including means adapted to adjust the synthetic color of outputted light by individually changing a height of each lens part provided to the LEDs of R, G, and B, respectively.
  • the LEDs 4a, 4b, and 4c of R, G, and B are mounted on one piece of a rectangular LED substrate 5 as shown in Fig. 15 , which is configured so that a predetermined current value can pass through the LEDs 4a, 4b, and 4c of R, G, and B, respectively.
  • a mechanism in which independent lens parts (panel parts) 7a, 7b, and 7c are provided on upper portions of the LEDs 4a, 4b, and 4c of R, G, and B, respectively, and their heights are independently varied up and down as shown by arrowed lines, respectively is included.
  • the color unevenness of the LEDs 4a, 4b, and 4c of R, G, and B is adjusted to emit a predetermined light color by changing their transmittance through: detection and comparison of the light color with a predetermined light output (for example, white); and adjustment of the individual heights of the LEDs parts (panel parts) 7a, 7b, and 7c.
  • a lens part having an uneven thickness is provided to an upper portion of a round-shaped LED unit mounting the LEDs of R, G, and B; and transmittance of lights from the respective LEDs are changed by rotating the lens part.
  • the LEDs of R, G, and B are mounted on a round-shaped substrate 8, which is configured so that a predetermined current value can pass through the LEDs of R, G, and B, respectively, and a lens part 9 is provided to their upper portions.
  • a thickness of the lens part 9 is not even, a lens thicknesses at the upper portions of the LEDs of R, G, and B are designed to be different from each other, and the lens part 9 is configured to be able to rotate.
  • the symbol R represents a red LED
  • the symbol G represents a green LED
  • the symbol B represents a blue LED
  • a number 10 represents a lens frame part.
  • the synthetic light is adjusted to be the predetermined light color by rotating the lens part 9 to change transmittance of the respective lights of the LEDs of R, G, and B.
  • Figs. 16 (b) and (c) illustrate as images that each of the lens thicknesses at the upper portions of the LEDs of R, G, and B changes when the lens part 9 rotates 180 degrees.
  • each of the LEDs of R, G, and B is stored in a room with partitions; and means adapted to change apertures of aperture windows 11a, 11b, and 11c provided to their upper portions is included.
  • the symbol R represents the red LED
  • the symbol G represents the green LED
  • the symbol B represents the blue LED.
  • the LEDs of R, G, and B are mounted on the rectangular substrate 5, a structure able to house the LEDs of R, G, and B in rooms each individually having a window is employed, and a light color is adjusted by change areas of the aperture windows 11a, 11b, and 11c to change light outputs of the LEDs of R, G, and B, respectively.
  • the synthetic light color is different from a predetermined light color due to the color unevenness of the LEDs of R, G, and B
  • the synthetic light is adjusted to be the predetermined light color by changing the aperture areas of the aperture windows 11a, 11b, and 11c to adjust lights of the LEDs of R, G, and B.
  • a lens part provided at an upper portion of the LEDs of R, G, and B as means adapted to adjust an emission amount includes a light guiding plate 12; and a color of the light guiding plate 12 is changed by using a second RGB light source 13 as a light source of the light guiding plate 12.
  • the LEDs 4a, 4b, and 4c of R, G, and B are mounted on one piece of the substrate 5; the light guiding plate 12 is arranged at their upper portion; and the another second RGB light source 13 is additionally provided to the light guiding plate 12 to change a color of the light guiding plate 12.
  • the second RGB light source 13 is, for example, an RGB bulb.
  • the synthetic light is adjusted to be the predetermined light color by: changing a light color of the second RGB light source 13 to change the light color from the light guiding plate 12.
EP09163665.4A 2008-06-24 2009-06-24 Dispositif d'éclairage à DEL Not-in-force EP2139296B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008165056A JP5204563B2 (ja) 2008-06-24 2008-06-24 Ｌｅｄ照明装置

Publications (3)

Publication Number Publication Date
EP2139296A2 true EP2139296A2 (fr) 2009-12-30
EP2139296A3 EP2139296A3 (fr) 2015-06-03
EP2139296B1 EP2139296B1 (fr) 2018-02-21

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EP09163665.4A Not-in-force EP2139296B1 (fr) 2008-06-24 2009-06-24 Dispositif d'éclairage à DEL

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US (1) US8143809B2 (fr)
EP (1) EP2139296B1 (fr)
JP (1) JP5204563B2 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
GB2589409A (en) * 2019-08-21 2021-06-02 Electronic Theatre Controls Inc Systems, methods, and devices for controlling one or more LED light fixtures

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WO2013014568A1 (fr) * 2011-07-26 2013-01-31 Koninklijke Philips Electronics N.V. Appareil de détermination de courant
US9386665B2 (en) 2013-03-14 2016-07-05 Honeywell International Inc. System for integrated lighting control, configuration, and metric tracking from multiple locations

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
GB2589409A (en) * 2019-08-21 2021-06-02 Electronic Theatre Controls Inc Systems, methods, and devices for controlling one or more LED light fixtures
GB2589409B (en) * 2019-08-21 2022-10-12 Electronic Theatre Controls Inc Systems, methods, and devices for controlling one or more LED light fixtures

Also Published As

Publication number Publication date
EP2139296A3 (fr) 2015-06-03
US20100019691A1 (en) 2010-01-28
US8143809B2 (en) 2012-03-27
EP2139296B1 (fr) 2018-02-21
JP5204563B2 (ja) 2013-06-05
JP2010009790A (ja) 2010-01-14

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